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윤수한, 강경원 공주교육대학교 초등교육연구소 2000 초등학교교육연구 = Elementary school education research Vol.1 No.2
This paper purposes to provide a new perspective for better development of geography texts. For this purpose, we have applied spatial cognition development theory to children's mental map. We have suggested that children's spatial operation ability has three space, euclidean space. This study turns out that Piaget and Inhelder's spatial concept development theory is on the right track. However, we make clear that their division according to the age is not always accurate due to children's individual differences. Furthermore, we have applied Appleyard's method to children's mental map analysis. As a result, we have found that higher-grade students increase in variety and accuracy of their mental map. These findings have educational implications as the following: First, pictorial maps and illustation in the textbook are not suitable to most children in the development stage of projective space. Second, we object to map drawing activity because map drawing is beyond the developmental stage of projective space.
윤수한(S.H.Yoon),이중순(J.S.Lee),김현지(H.J.Kim),박춘근(C.G.Park),하종률(J.Y.Ha) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
This research is about lean burn which can be satisfied with the limitation of both exhaust gas and fuel consumption. But as the mixing ratio is lean, combustion state becomes unstable, the ignitability becomes bad, and the mean effective pressure decrease. To solve the problems is one of the most important things. The aim of this study is to extend the lean limit and to make rapid combustion for the stable combustion, the improvement of fuel consumption ratio and the decrease of hamful gas. <br/> It is possible to extend the lean inflammability limit in the IDI engine. We can greatly<br/> improve the ignitability in the lean field by providing the sub-chamber with methanol.<br/> This study shows that we can design and produce the sub-chamber type constant volume combustion chamber. We can use methanol as the fuel to be injected into the chamber with the high pressure of 8∼20MPa.<br/> Like this, we define the combustion process, extend the lean inflammability limit therefore we can give you some useful materials for the developments and improvment of lean burn engine.<br/>
솔레노이드를 사용한 정압 연료분사 장치의 제어에 관한 연구
윤수한(S.H.Yoon),김현지(H.J.Kim),배종용(J.Y.Bae),하종률(J.Y. Ha) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_1
For the practical use of a fuel injection system using solenoid, some mechanical and electrical problems should be explicitly analyzed. In our study, we have investigated these problems experimentally and have improved such that a solenoid driving circuit is liable to establish a fast response and a precise control of injection quantity. This developed device is capable to control equivalance ratio from low level to high level. Therefore, we are expected that this developed device should be applicable to an actual engine.<br/>
요양보호사들의 심폐소생술 교육경험과 태도가 수행자신감에 미치는 영향
윤수지(Susie Yoon),서혜진(Hye-Jin Seo) 한국산학기술학회 2017 한국산학기술학회논문지 Vol.18 No.9
본 연구는 요양보호사들의 심폐소생술 교육경험과 태도가 심폐소생술 수행자신감에 미치는 영향을 파악하고자 실시한 서술적 조사연구로 2017년 2월에서 4월까지 C도 내에 근무 중인 요양보호사 140명을 대상으로 조사하였다. 수집된 자료는 SPSS/WIN 20.0 program을 이용하여 분석하였다. 심폐소생술 교육경험과 태도와 수행자신감의 비교는 t-test, ANOVA로 분석하였고, 사후검정은 Scheffe’ test로 분석하였다. 대상자의 일반적인 특성과 심폐소생술에 대한 태도 및 수행자신감의 상관관계는 Pearson correlation coefficient로 분석하였고, 심폐소생술 수행자신감에 미치는 영향요인은 Multiple regression을 이용하여 분석하였다. 연구 결과 심폐소생술에 대한 태도와 수행자신감은 높은 상관관계가 나타났으며(r=0.41, p<.001), 심폐소생술 수행자신감에 영향을 미치는 요인으로는 긍정적인 심폐소생술과 관련된 태도(β=0.34)와 4시간 이상의 교육시간(β=0.28)으로 나타났다. 본 연구 결과를 바탕으로 요양보호사들이 노인 요양보호시설에서 발생하는 심정지 응급상황에 적절한 대처를 수행할 수 있도록 심폐소생술에 대한 지속적인 교육이 필요함을 알 수 있었으며 이를 위해서는 요양보호사를 위한 맞춤형 심폐소생술 교육 프로그램 개발이 진행되어야 할 것이며 요양보호사 직무교육 또는 보수교육에 심폐소생술에 대한 교육과정이 포함되는 방안이 마련되어야 할 것이다. This study was conducted to evaluate the influence of educational experience and attitude toward performance confidence of cardiopulmonary resuscitation amongcare helpers. This study was conducted using a descriptive survey design. Participants were 140 care helpers in C-province. Data were collected from February to April, 2017 using self-report questionnaires andthe collected data were analyzed using the SPSS WIN 20.0 program. Differences amongstudy variables by participants" characteristics were analyzed by a t-test, ANOVA, and Scheffe" test. Correlations between attitudes and confidence of CPR performance by Pearson"s correlation coefficients. Factors influencing confidence in CPR were analyzed by Multiple regression. There were significant positive correlations between attitude and confidence in CPR(r=0.41, p<0.001). The result showed that the more than fourhours of education(β=0.28) and a positive attitude toward CPR increased CPR performance confidence. Based on the present findings, CPR education should be included continuously in the workplace and developed to appropriately cope with cardiac arrest emergency situations in care facilitiesfor elderly people. Therefore, customized CPR education programs should be developed care helpers and included in job training and refresher education courses for care helpers.
중간간격을 갖는 교류형 플라즈마 디스플레이 표시기의 소거파형 연구
윤수한(Su-Han Yoon),서정현(Jeong-Hyun Seo) 대한전기학회 2011 전기학회논문지 Vol.60 No.5
In this paper we suggest new criteria for the classification of the electrode gap between common and scan electrodes. The electrode gap is categorized as a short, middle, and long gap according to the criteria. Among these structures, we focus on the erase waveform of a mid-gap structure. we report an unstable discharge arising from the erase ramp period in a mid-gap structure. Based on the Vt close curve, we analyze the unstable discharge at various conditions. Our analysis reveals that the unstable discharge is ignited between surface electrodes and caused by un-erased wall charges accumulated on the outer edges of electrodes. By reducing the voltage level of the last sustain pulse, the problem is solved.
윤수한(S.H.Yoon),이중순(J.S.Lee),전대수(D.S.Jun),정성식(S.S.Chung),하종률(J.Y.Ha) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
In this research, we use IDI type constant volume combustion chamber which is made possible to stratified combustion to construct the design back data of lean-burn engine. Some experiments are conducted by the passagehole angle in the adapter of main and sub-chamber. The effects on the comustion according to the discharge characteristics are investigated. The used fuel is methanol prospective as an alternative fuel. Flame propagation process in the main and sub-chamber are analyzed by pictures. As the results experiments, combustion characteristics reveals that ignition timing, passagehole angle.and discharge method greatly effects on.<br/>
PC - ECU 를 이요안 SI 기관의 비정상상태 정밀공연비 제어
윤수한 한국액체미립화학회 2000 한국액체미립화학회지 Vol.5 No.3
In a SI engine, three-way catalyst converter has the best efficiency when A/F ratio is near the stoichiometry. The feedback control using oxygen sensors in the commercial engine has limits caused by the system delays. So it is necessary to control fuel quantity in accordance with intake air amount in order to reduce exhaust emission and improve the specific fuel consumption. Precise A/F ratio control requires measurement of air amount with respect. to the cylinder and injection fuel according to the air amount_ In this paper, we applied nonlinear fuel injection model, and developed the algorithm of A/F ratio control. This algorithm includes the methods of measurement of transient air mass flowing into each cylinder, of calculation of injection pulse width for measured air mass, and the method of feedback and engine control by using lambda sensor. Also we developed control program for IBM-PC by using C++ Builder, and tested it in the commercial engine.